# Audio Frequency Analyzer

> Real-time audio analyzer for iPhone measuring frequency response and FFT. (iPhone/iPad app by TOON,LLC.)

- Source: https://appshunter.io/ios/app/audio-frequency-analyzer/id684641742 (this page in markdown: same URL + `.md`)
- Developer: [TOON,LLC](https://appshunter.io/developer/633948723)
- Category: Utilities
- Price: $9.99
- Rating: 3.70/5 from 3 App Store ratings · 10 written reviews indexed
- Age rating: 4+
- Requires: iOS 26.2 · 0 MB
- Languages: American English
- Released: 2013-08-31
- Data updated: 2026-08-27
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/audio-frequency-analyzer/id684641742/reviews.md

## What is Audio Frequency Analyzer?

"Audio Frequency Analyzer" is a powerful real-time audio analyzer (RTA) app for iPhone. 

With its simple operation, you can easily measure and evaluate your sound environment.

This app measures the frequency response in 30 split band scale of 1/3 octave in real time. It can also display the FFT analysis results. 

It supports calibration for 1/3-octave bands. By adjusting the characteristics to match not only the built-in microphone but also your external microphone, it achieves high measurement accuracy.

"Audio Frequency Analyzer" can be used for various applications, including sound room tuning, speaker settings, audio equipment testing, stage setup measurement, sound mixing environment evaluation and noise environment investigation.

Features: 
- Frequency spectrum response measurement of 1/3 octave unit, 30 bands. (OCT)
- FFT Analyzer (FFT)
- Observation frequency range: 20 - 23000 Hz
- Logarithmic amplitude display. 
- Touch-scroll function to adjust visible amplitude ranges. 
- Display the measured value of 1/3 oct bands at OCT mode. (dB@OCT) 
- Function to change the graph slope at FFT mode. (Slope): -3dB/oct (less than 1kHz), +3dB/oct (1kHz or higher)  
- Peak hold function. (Hold)
- Average display function. (Avg): Time linear averaging. Fast-2.56sec, Slow-12.8 sec
- Display response control. (Fast/Slow)
- Reset of Measurement display position. (Scroll)
- Snapshot of Measurement display. (Snap)
- Calibration function in OCT mode. (Calibrate): 1/3 octave band offset and total offset setting.
- Supports built-in microphone, headset microphone, and external digital audio connection. 

Note: 
The first time you access your microphone and photos after installing the app, the iOS system will ask you for permission to access them. If you have not enabled this setting, the app will not be able to access them due to iOS system privacy restrictions. Please enable the access permission in the iOS setting "Settings > Privacy & Security > Photos or Microphone".

Please visit our iOS app support page for more information about this app.

## Key features

- Real-time frequency spectrum response measurement (1/3 octave, 30 bands)
- FFT Analyzer
- Observation frequency range: 20 - 23000 Hz
- Calibration function for high accuracy
- Supports built-in and external microphones
- Snapshot and averaging functions

## Recent user reviews (10 of 10)

All indexed reviews: https://appshunter.io/ios/app/audio-frequency-analyzer/id684641742/reviews.md

### 5/5 — L K

*2026-06-07*

Works well for me to test the crossover frequency for my sub. iOS 26.5 iPhone pro 15. Thanks for not charging subscription.

**Developer response:** Thank you for using our app. We are delighted that our app is helping to improve the sound quality of your audio system. All of our currently available apps are one-off purchases, so you can use them with complete peace of mind.

### 1/5 — Does not work in iOS 18

*2024-10-10*

Since updating to iOS 18 this app opens but I can’t start a measurement. There is no input read on the mic.

**Developer response:** This app has also been confirmed to work properly on iPhones running iOS 18.0 or later.

If the iPhone's built-in microphone cannot be used for input, there may have been some sort of data migration error in the iOS settings during the iOS18 update process.

The following are two possible solutions to this issue.

(1) In the iOS settings, grant permission to this app to use the microphone. In the Privacy & Security section, select the Microphone and enable this app. Therefore, please enable permissions in the iOS settings “Settings > Privacy & Security > Microphone > AFA”.

(2) If the previous section does not solve this issue, delete this app and install it again. When the app is first launched after installation, the iOS will ask for permission to use the microphone, so please allow this app use.

Please refer to our app support site for more information.
http://www.toon-llc.com/support/fokannonlite_en.html

If this issue persists, please contact our app support desk directly via email.
Thank you.

### 3/5 — ATGとの同時使用に関して

*2023-06-25*

車のスピーカー特性のチューニングに本アプリとATGを購入したが、ATGのホワイトノイズをBluetooth経由で再生しながら本アプリを立ち上げるとATGの再生が停止してしまう。
せっかく同じ会社で開発されているので同時使用できるように改善して欲しい。

### 5/5 — Great tool

*2020-07-07*

This a great tool that just plain works and is reliable. Been using itfor years! Really helps ringing out monitors on stage.

### 3/5 — 単純明解なアナライザーです。

*2019-08-29*

単純明解なんですが、表示レンジが全て「ー」表示になるんで、0dBを任意の数値に変更出来て、１コマ10dBを5dBとか任意の値にコントロール出来れば、星５ツでした。（もう少し細かく見たいです）
後、欲を言うなら、SLOWにするとカクカク動くので、もう少しなんとかなればと、平均化する事が出来れば100点でした。
全帯域でマイクのキャリブレーションが出来るのは、とても良い機能なんですが…。このアプリだけでキャリブレーションするのは、ちょっとシンドイです。
それと、大きな信号が入ると内蔵マイクに切り替わるらしいのですが、何のマイクを受けているのか？！分からない事と、動いていて触らないでいると、画面がスリープになるのもなんとかなりませんかネ？！
バージョンアップに大きく期待して、ちょっと辛口意見でした。

### 1/5 — Don't get

*2016-09-20*

I wouldn't even give it a star it's trash

### 5/5 — Spectrum Analyzer

*2016-05-04*

過去にPaa3というSpectrum Analyzerを購入して使っていました。測定結果が画像として保存できなくて困っていたところ、iPhoneアプリでAudio Frequency Analyzerを知り、購入しました。
Peak Hold機能や、画像を保存できるSNAP機能は、私の使用目的（スピーカーのf特の測定）には満点です。しかもPaa3の¥39,800に対してこのアプリは¥720、安すぎる、というわけで星5つです。

### 5/5 — バージョンアップ最高

*2014-07-13*

今回のバージョンアップで、iphoneのマイクのローカットフィルターを補正する機能が実装された。
完成度と、実用性は、飛躍的に高まり、ほぼ文句なしの内容になった。細かい改良点は、まだあるかと思うが(レスポンスの調整機能など)ユーザーフレンドリーな姿勢は、素晴らしい。今後も注目していきたい。

### 4/5 — Nice app! Very useful

*2014-04-22*

Hi,
thanks for this app. It's exactly what i was looking for. You should probably take a few moments to add a quick user guide on how to read the graphs. (I am a non specialist and it took me some time to figure things out.)

### 5/5 — 使い勝手が良い

*2013-09-01*

1/3オクターブの表示があり、使い勝手が良いアプリだと思います
カーオーディオのセッティングに利用しました

## Frequently asked questions about Audio Frequency Analyzer

### What is Audio Frequency Analyzer used for?

Audio Frequency Analyzer is used for real-time sound environment measurement and evaluation. It's helpful for sound room tuning, speaker settings, audio equipment testing, stage setup measurement, sound mixing environment evaluation, and noise investigation.

### Does Audio Frequency Analyzer have ads?

No, Audio Frequency Analyzer does not contain advertisements. It is a paid application.

### What is the price of Audio Frequency Analyzer?

Audio Frequency Analyzer is available for a one-time purchase of $9.99.

### What devices does Audio Frequency Analyzer support?

Audio Frequency Analyzer is designed for iPhone and is compatible with supported iPhone models.

### How accurate is Audio Frequency Analyzer?

The app achieves high measurement accuracy through its calibration function for 1/3-octave bands, allowing adjustment for both built-in and external microphones.

### What is the frequency range of Audio Frequency Analyzer?

Audio Frequency Analyzer can observe frequencies from 20 Hz up to 23000 Hz, covering a wide spectrum of audible sound.

### How often is Audio Frequency Analyzer updated?

The app was last updated on February 26, 2026, indicating it receives regular updates to maintain functionality and compatibility.

### What is the age rating for Audio Frequency Analyzer?

Audio Frequency Analyzer has an age rating of 4+, making it suitable for users of all ages.

## Version history (last 5 releases)

### 11.1 — 2026-08-08

- Improved internal processing and performance.

### 11.0 — 2026-02-26

- Improved internal processing and performance.
- Requires iOS 26.2 or later.

### 10.1.1 — 2025-12-18

- Improved internal processing and performance.
- Requires iOS 18.7 or later.

### 10.1 — 2025-03-04

- Added Average display function.
- Changed UI design.
- Requires iOS 18.2 or later.

### 10.0 — 2024-11-26

- Renewed UI design.
- Requires iOS 18.1 or later.

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## More apps by TOON,LLC

- [Audio Tone Generator Lite](https://appshunter.io/ios/app/audio-tone-generator-lite/id633948720)
- [Sound Level Analyzer Lite](https://appshunter.io/ios/app/sound-level-analyzer-lite/id886090835)
- [Sound Level Analyzer](https://appshunter.io/ios/app/sound-level-analyzer/id886109671)
- [Hearing Analyzer Portrait](https://appshunter.io/ios/app/hearing-analyzer-portrait/id922806926)
- [Hearing Analyzer Lite](https://appshunter.io/ios/app/hearing-analyzer-lite/id922827806)

All apps by TOON,LLC: https://appshunter.io/developer/633948723

## Related topics

[audio frequency analyzer](https://appshunter.io/ios/topics/audio-frequency-analyzer)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-27.*